text: There have been recalls for various medications due to the presence of nitrosamine impurities. There have been recalls for angiotensin II receptor blockers, ranitidine, valsartan and others.
  The US Food and Drug Administration published guidance about the control of nitrosamine impurities in medicines. Health Canada published guidance about nitrosamine impurities in medications and a list of established acceptable intake limits of nitrosamine impurities in medications.